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Track gauge conversion is the changing of one railway track gauge (the distance between the running rails) to another. In general, requirements depend on whether the conversion is from a wider gauge to a narrower gauge or vice versa, on how the rail vehicles can be modified to accommodate a track gauge conversion, and on whether the gauge conversion is manual or automated.
While China and Europe are connected by rail, and while both are mainly 1,435 mm (4 ft 8 + 1 ⁄ 2 in), the intervening Central Asia Railways are 1,520 mm (4 ft 11 + 27 ⁄ 32 in) gauge. There are discussions about facilitating an eventual linkage of the Chinese and European standard gauge system.
Some railways, primarily in the northeast, used standard gauge of 4 ft 8 + 1 ⁄ 2 in (1,435 mm); others used gauges ranging from 2 ft (610 mm) to 6 ft (1,829 mm). As a general rule, southern railroads were built to one or another broad gauge, mostly 5 ft ( 1,524 mm ), while northern railroads that were not standard-gauge tended to be narrow-gauge.
At present [when?] the choice of gauge is limited to two out of three of 1,435 mm (4 ft 8 + 1 ⁄ 2 in) and broad gauges 1,520 mm (4 ft 11 + 27 ⁄ 32 in) and 1,676 mm (5 ft 6 in). With narrow gauges such as 1,000 mm ( 3 ft 3 + 3 ⁄ 8 in ) as found at Zweisimmen , Switzerland, there is less room between the wheels for the gauge change ...
1,372 mm 4 ft 6 in: See 4 ft 6 in gauge railway: 1,384 mm 4 ft 6 + 1 ⁄ 2 in: Scotland various railways in Scotland prior to 1840 1,397 mm 4 ft 7 in: Wales Duffryn Llynvi and Porthcawl Railway [90] 1,416 mm 4 ft 7 + 3 ⁄ 4 in: England Huddersfield Corporation Tramways: Scotland List of town tramway systems in Scotland: 1,422 mm 4 ft 8 in ...
Length; system unit code (other) symbol or abbrev. notes conversion factor/m combinations SI: gigametre: Gm Gm US spelling: gigameter: 1.0 Gm (620,000 mi) megametre: Mm Mm US spelling: megameter: 1.0 Mm (620 mi) kilometre: km km US spelling: kilometer: 1.0 km (0.62 mi) km mi; hectometre: hm hm US spelling: hectometer: 1.0 hm (330 ft) decametre ...
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).
Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.